198678 has 8 divisors (see below), whose sum is σ = 397368. Its totient is φ = 66224.

The previous prime is 198673. The next prime is 198689. The reversal of 198678 is 876891.

It is a sphenic number, since it is the product of 3 distinct primes.

198678 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198673) by changing a digit.

198678 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16551 + ... + 16562.

It is an arithmetic number, because the mean of its divisors is an integer number (49671).

2¹⁹⁸⁶⁷⁸ is an apocalyptic number.

198678 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198678 is a wasteful number, since it uses less digits than its factorization.

198678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33118.

The product of its digits is 24192, while the sum is 39.

The square root of 198678 is about 445.7331039983. The cubic root of 198678 is about 58.3512180988.

The spelling of 198678 in words is "one hundred ninety-eight thousand, six hundred seventy-eight".